Bob works as a cashier in a supermarket. his boss instructs him to include the price of a new broom—which bob's boss has deceptively placed near the register—on everyone's bill. bob's boss also encourages him to change the dates on expired food items so the items can continue to be sold. eventually, bob begins to develop his own deceptive sales practices. this is an example of

This is an example of differential association.

Explanation:

Differential association theory was created to explain why people tend to commit crimes. The theory states that such behaviour is largely learned through various ways. For example, by interacting with others. It also says that a person becomes a criminal due to continuous criminal patterns which later become a habit which is hard to let go. Differential association theory best fits in the given scenario because Bob is learning deceptive sales practices from his boss.